(19)

(11)

EP 0 667 052 A1

(12)

(43) Date of publication: 16.08.1995 Bulletin 1995/33 (21) Application number: 93924357.0 (22) Date of filing: 19.10.1993

(51) International Patent Classification (IPC):  H01F 21/ 00( . ) H01F 38/ 14( . ) H02J 7/ 00( . ) H02J 17/ 00( . ) B60L 11/ 18( . ) H02J 5/ 00( . ) H02J 7/ 02( . ) (86) International application number: PCT/US1993/009975 (87) International publication number: WO 1994/009544 (28.04.1994 Gazette 1994/10)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 20.10.1992 US 19920963590 (71) Applicant: ELECTRIC POWER RESEARCH INSTITUTE, INC Palo Alto California 94303 (US)	(72) Inventors: KLONTZ, Keith, W. Sun Prairie, WI 53590 (US) DIVAN, Deepakraj, M. Madison, WI 53719 (US) NOVOTNY, Donald, W. Madison, WI 53705 (US) LORENZ, Robert, D. Madison, WI 53711 (US) (74) Representative: Cross, Rupert Edward Blount, et al  BOULT, WADE & TENNANT 27 Furnival Street London EC4A 1PQ London EC4A 1PQ (GB)